This 14pc Jake Brake Tool Set is used on engine intake and exhaust valve adjustment with or without engine brakes and engine brake rocker. This is an alternative to 88880052, 85111377 and 88880053. This Mack set will contain 0.2mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 1.0mm, 0.045" 1.6mm, 2.0mm, 2.3mm, 2.5mm, 3.5mm, 3.6mm, 4.2mm feeler gauges. Applications would be for MP7, MP8, MP10, D12, D13, D16 and other engines (refer to shop manual for proper use).